Mump 0506 08 Z Mustang Rally Pac Install Grounding The Wires

7 The black ground wire (with the small ring terminal soldered to it) is the main ground lead for the Rally-Pac and needs to be connected to a clean, secure ground path. There are plenty of dash screws you can use, but we simply added it to the several other ground wires found at the right dash brace. The red wire with the green connector is not used in the V-8 application.